Composition fob treating iron and its alloys



UNITED STATES PATENT OFFICE.

W'ILLIAM H. FISHER, OF LOS ANGELES, AND PETER CHAMBERS, OF BEDONIDO BEACH, CALIFORNIA.

COMPOSITION FOR TREATING IRON AN D ITS ALLOYS.

Specification of Letters Patent.

, Patented Feb. 7, 1922.

No Drawing. Original application filed May 18, 1920, Serial No. 382,290. Divided and. this application filed October 13, 1920. Serial No. 416,658.

Angeles and Redondo Beach, in the county of Los Angeles and State of California, have invented a new and useful Composition for Treating Iron and its Alloys, of which the following is a specification.

This invention relates to a liquid hydrocarbon to be used for treating iron and iron alloys, which liquid hydro-carbon constitutes a new composition of matter, and the invention has for its objects the provision of such new composition of matter which will be relatlvely superior in speed and effectiveness of service in carbonizing steel and other metals and also in inexpensiveness, convenience, as well as simplicity in composition.

The invention may be utilized with an apparatus and furnace such as that set forth and disclosed and claimed in our parent application for United States patent for apparatus for treating iron and iron alloys and process therefor, filed by us May 18, 1920, Serial No. 382,290, and which may likewise be utilized in carrying on the processes disclosed and claimed in our divisional applica tion for United States patent executed by us this 30th-day of September, 1920, preparatory to filing the same.

In any form of furnace that might utilize a hydro-carbon, it is commonly known that the actual carbonization of the metals within the furnace is due to the hot gases which are either liberated by the case-hardening compound or formed by the reaction between the occluded air within the furnace and the carbon. It is also well known that the active case-hardening reagent is a gas or a mixture of gases and that even when a powder is used that it is the gas liberated from the hot powder and not the solid itself that performs the Work. Consequently, the use of a particular liquid hydrocarbon such as that about to be described, readily performs its work in a most eflicient, quick manner and without waste. It 'has been found that the liquid hydrocarbon about to be disclosed, when vaporized, does not oxidize the steel nor make deposits of carbon in'the furnace. Furthermore, the liquid hydrocarbon when vaporized has no oxidizing effect on chromium and other alloyed steels.

It has been found by experiment that a liquid hydro-carbon which consists essentially in using in proportion by volume pine tar forty per cent, spirits of turpentine twenty per cent, and linseed oil forty per cent, will most efiiciently, when gasified, carburize or caseharden steel. A combination of these particular elements to form the hydrocarbon fluid will perform all the functions that have been above attributed to said hydrocarbon fluid.

It is manifest that many variations in the particular nature and relative proportions of the ingredients of the carburizing compound in constituting the invention may be made Without departing from the true spirit of the invention.

Having thus disclosed our invention, we claim and desire to secure by Letters Patent:

1. A carbonizing compound for steel and like metals, comprising spirits of turpentine and linseed oil.

2. A carbonizing compound for steel and like metals, comprising pine tar and turpentine.

3. A carbonizing compound for steel and like metals, comprising pine tar, a solvent for the pine tar, and linseed oil.

. 4. A hydrocarbon compound for carbonizing steel and like metals, comprising pine tar, turpentine, and linseed oil.

5. A hydrocarbon compound for carbonizing steel and like metals, comprising linseed tar.

6. A hydrocarbon compound for carbonizing steel and like metals, comprising pine tar, linseed oil, and 20%, by volume, of turoil, turpentine, and 4.0%, by volume, of pine 

